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CHADWELL, C. DAVID

Associate Research Geophysicist

Degrees:

• B.S., Ohio State University
• B.S., Ohio State University
• M.S., Ohio State University
• Ph.D., Ohio State University

Research Interests:

• Development of seafloor geodetic techniques using GPS and precision acoustics
• Seafloor crustal deformation at oceanic spreading centers and subduction thrust faults
• GPS meteorology in ocean environments

Courses Recently Taught:

• SIO 226: Introductn/Marine Geophysics
• SIO226: Introductn/Marine Geophysics

Mentoring:

• Gagnon, Katie (Graduate; 2002-2007)
• Kussat, Neil (Masters; 2001-2004)
• Phillips, Kathleen (Graduate; 2000-2006)

Phillips, K.A., C.D. Chadwell, J. A. Hildebrand Vertical deformation measurements on the submerged south flank of Kilauea volcano, Hawaii reveal seafloor motion associated with volcanic collapse, Journal of Geophysical Research, Vol. 113, B05106 , 15 pp. (2008).

Chadwell, C.D., F.N. Spiess Plate motion at the ridge-transition boundary of the south Cleft Segment of the Juan de Fuca ridge from GPS-data, Journal of Geophysical Research, Vol. 113, B04415 , 15 pp. (2008)

Gagnon, K.L., C.D. Chadwell Relocation of a seafloor transponder-Sustaining the GPS-Acoustic technique Earth Planets Space, 59, 327-336, (2007).

Osada, Yukihito, H. Fujimoto, T. Kanazawa, S. Nakao, S. Sakai, S. Miura, J. Hildebrand and C.D. Chadwell Development of a GPS/Acoustic Seafloor Positioning System for 6,000 m Water Depth and its Trial Experiments at Sea Journal of the Geodetic Society of Japan, Vol. 52, No. 3, pp. 171-182, (2006).

D’Spain, Gerald, L., E.Terrill, and C.D. Chadwell Active control of passive acoustic fields: Passive synthetic aperture/Doppler beamforming with data from an autonomous vehicle Journal Acoust. Society of America, 120 (6) , December (2006).

Gagnon, K.L., C.D. Chadwell, E. Norabuena Measuring the onset of updip locking in the Peru-Chile Trench at 12°S from GPS and Acoustic measurements, Nature, Vol. 434, pp.205-208, (2005).

Zimmerman, R., G.L. D’Spain, and C.D. Chadwell Decreasing the Radiated Acoustic and Vibration Noise of a Mid-Sized AUV, Journal of Oceanic Engineering, Vol. 30, No.1, pp. 179-187, (2005).

Kussat, N.H., C.D. Chadwell, and R. Zimmerman: Absolute Positioning of an Autonomous Underwater Vehicle using GPS and Acoustic Measurements IEEE Journal of Engineering, Vol. 30, No.1, pp.153-164, (2005).

Osada, Y., H. Fujimoto, S. Miura, A. Sweeney, T. Kanazawa, S. Nakao, S. Sakai, J.A. Hildebrand, and C.D. Chadwell: Estimation and correction for the effect of sound velocity variation on GPS/Acoustic seafloor positioning: An experiment off Hawaii Island, Earth Planets Space, Vol. 55, e17-e20, (2003).

Chadwell, C. D. Shipboard Towers for Global Positioning System Antennas, Ocean Engineering, Vol. 30, 1467-1487, (2003).

Sweeney, A. D., C. D. Chadwell, J. A. Hildebrand Calibration of a seawater sound velocimeter IEEE Journal of Oceanic Engineering, Vol. 31, No.2, pp.1-8, (2006).

Sweeney, A. D., C. D. Chadwell, J. A. Hildebrand, F. N. Spiess Centimeter-level positioning of seafloor acoustic transponders from a deeply-towed interrogator, Marine Geodesy, Vol 28, pp. 39-70, (2005).

Chadwell, C.D., Y. Bock Direct estimation of absolute precipitable water in oceanic regions by GPS tracking of coastal buoy, Geophys. Res. Letts., Vol. 28, No. 19, pp. 3701-3704, (2001).

Chadwell, C.D. Reliability analysis for design of stake networks to measure glacier surface velocity. J. Glaciol ., Vol. 45, No. 149, pp. 154-164, (1999).

Chadwell, C.D., J.A. Hildebrand, F.N. Spiess, J. L. Morton, W.R. Normark, and C.A. Reiss No spreading across the southern Juan de Fuca Ridge axial cleft during 1994-1996, Geophys. Res. Lett. Vol. 26, No. 16, pp. 2525-2528, (1999).

Chadwell, D., F. Spiess, J. Hildebrand, L. Young, G. Purcell, Jr., and H. Dragert Deep-Sea Geodesy: Monitoring the ocean floor, GPS World, Vol. 9, No. 9, pp. 44-55, (1998).

Spiess, F.N., C.D. Chadwell, J.A. Hildebrand, L.E. Young, G.H. Purcell,Jr, and H. Dragert Precise GPS/acoustic positioning of seafloor reference points for tectonic studies. Physics of the Earth and Planetary Interiors, Vol. 108, pp 101-112, (1998).

Chadwell, C.D., F.N. Spiess, J.A. Hildebrand, L.E. Young, J. G.H. Purcell and H. Dragert Sea floor strain measurement using GPS and Acoustics, GraGeoMar 96 Symposium Proceedings, University of Tokyo, in Gravity,Geoid, and Marine Geodesy, J. Segawa, H. Fugimoto, and S. Okubo, eds., International Association of Geodesy Symposia, V117, Springer Verlag, pp. 682-689, May (1997). (Reviewed as rigorously as research articles)